Katy Perry performed hit song 'Firework' in the inauguration concert of US President Joe Biden and Vice President Kamala Harris. (Video: Biden Inauguration Committee)

Amanda Gorman, a 22-year-old poet, read an original work at President Joe Biden’s inauguration on Jan. 20. After Biden was sworn in as the nation’s 46th president, Gorman read “The Hill We Climb,” building on a tradition of poets -- including Robert Frost, Maya Angelou, Elizabeth Alexander and Rich

Pop superstar Lady Gaga performs a rendition of “The Star Spangled Banner” at the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris.

Great performance by Demi Lovato during the Biden/Harris Presidential and Vice Presidential Inauguration. OMG!!! This makes me beyond HAPPY!!!!! Welcome back, America!!!!

Three presidents of the United States of America: one message of unity.Watch Presidents Barack Obama, George Bush, and Bill Clinton's special message to President Joe Biden.

Sometimes you promise someone forever but it doesn't work out that way. Watch Katy Perry and Diego Luna star in the sixth chapter of the "Teenage Dream" story.

Singer Jennifer Lopez performs at the inauguration of Joe Biden and Kamala Harris.

Things were never the same again after shirtless YouTuber WatchBenSing had an onstage encounter with Katy Perry.

Music video by Katy Perry feat. Kanye West performing E.T. Director: Floria Sigismondi Producers: Natasha Alexsa Garcia, Danny Lockwood, Kelly Norris Sarno

Katy Perry's "Firework" is the first non-Christmas song I synchronized to lights. The song is a favorite with the entire family and my wife and kids sing along whenever it is on. In October 2011 Light-O-Rama came out with their new S3 software and I was really excited to sequence a song, and I'd bee...